CN115140994A - High-strength cementing material, mould bag concrete, and preparation and application thereof - Google Patents
High-strength cementing material, mould bag concrete, and preparation and application thereof Download PDFInfo
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- CN115140994A CN115140994A CN202210701043.7A CN202210701043A CN115140994A CN 115140994 A CN115140994 A CN 115140994A CN 202210701043 A CN202210701043 A CN 202210701043A CN 115140994 A CN115140994 A CN 115140994A
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- 239000004568 cement Substances 0.000 claims abstract description 39
- 239000010440 gypsum Substances 0.000 claims abstract description 33
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 33
- 239000006227 byproduct Substances 0.000 claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000011707 mineral Substances 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 68
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 46
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- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 20
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 17
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 17
- 239000000292 calcium oxide Substances 0.000 claims description 16
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 16
- 235000010261 calcium sulphite Nutrition 0.000 claims description 16
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 4
- 229910000391 tricalcium phosphate Inorganic materials 0.000 claims description 4
- 235000019731 tricalcium phosphate Nutrition 0.000 claims description 4
- 229940078499 tricalcium phosphate Drugs 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- 229910052925 anhydrite Inorganic materials 0.000 claims description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- -1 fluorgypsum Substances 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/14—Preformed blocks or slabs for forming essentially continuous surfaces; Arrangements thereof
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/18—Reclamation of land from water or marshes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/205—Securing of slopes or inclines with modular blocks, e.g. pre-fabricated
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of cementing materials, in particular to a high-strength cementing material for mould bag concrete, related mould bag concrete and preparation and application thereof. The cement, the industrial by-product gypsum, the anti-caking agent and the mineral admixture are reasonably selected and matched as raw materials, in the preparation process of the mould bag concrete, the traditional coarse aggregate and fine aggregate are not used, the raw materials are locally obtained, the soil body of a construction site is used, and under the selection of a reasonable formula, the unconfined compressive strength of the concrete for 7 days is more than 6.5MPa, and the unconfined compressive strength of the concrete for 28 days is more than 10 MPa.
Description
Technical Field
The invention relates to the technical field of cementing materials, in particular to a high-strength cementing material for mould bag concrete, related mould bag concrete and preparation and application thereof.
Background
The mould bag concrete is a protective structure formed by using a continuous (or single) bag-shaped body made of double-layer high-strength woven chemical fiber fabric as a flexible template and filling the bag with concrete by a high-pressure pump. It can be used as earth and rockfill dam, bank protection and bottom protection for river, lake and coast. The thickness and shape of the grass sod planting frame are designed according to requirements, for example, drainage filter points can be arranged to drain accumulated water in a slope, all units are connected in a hinge mode to adapt to uneven settlement of the slope surface, and the grass sod is planted in a frame grid mode to improve the environment. The method has the characteristics of flexible design, convenient construction, reliable quality, capability of underwater construction without constructing a cofferdam and the like.
The existing mould bag concrete is generally prepared by using coarse aggregate, fine aggregate, cement and additives (such as a water reducing agent, a pour point regulator, an air entraining agent and a plastic retaining agent) as raw materials, and the formula of the existing mould bag concrete is prepared by using the traditional concrete formula idea. However, the formula cement has high consumption and strong dependence on resources of coarse aggregates and fine aggregates. At present, the price of cement rises to 800 yuan/ton, coarse aggregate resources such as yellow sand, stones and the like are in short supply, and the problem of raw material supply becomes severe day by day.
At present, researches and attempts are made to add various solid wastes into a mould bag concrete formula, for example, CN106904916A discloses a mould bag solidified soil for sea-filling cofferdam, and a preparation method and an application method thereof. The slurry shield machine of the excavation and tunneling engineering for the waste slurry is used for digging the waste slurry formed in the process or the waste slurry formed in the construction of the pile foundation engineering and the underground diaphragm wall engineering, although the effective utilization of solid waste can be achieved, in order to utilize the waste slurry, the waste slurry must be temporarily stored, and the waste slurry needs to be transported to a construction site during use, so that the storage and transportation cost is increased, and the operation is inconvenient. In addition, it requires the use of complex flocculants, slurry structurants and biomass fibres, which are complex in composition.
CN101456705A discloses hydraulic mould bag concrete using industrial solid waste, which is prepared from coarse aggregate, fine aggregate, cementing material, reinforcing fiber and water through the processes of stirring, mixing, injecting into a mould bag and the like. The coarse aggregate is steel slag or tailings, the fine aggregate is tailing sand or fly ash coarse slag or river sand, the continuous use of the fine aggregate is still the traditional formulation idea of the mould bag concrete, the coarse aggregate and the fine aggregate are required to be used, and the coarse aggregate and the fine aggregate cannot be obtained from local materials. For bank protection, river sand/river sand can be obtained from local resources, but the river sand/river sand resource is increasingly exhausted.
CN105130293A discloses a method for preparing a novel ecological bank protection material, which comprises 129-133 parts of water, 206-213 parts of cement, 52-53 parts of fly ash, 647-653 parts of sand, 1330-1342 parts of stone, 2.06-2.13 parts of water reducing agent and 0.015-0.016 part of air entraining agent, and the material suitable for protecting the bank slope of the river channel is prepared by using silt and water in the river channel as raw materials and assisting with materials such as broken stone, coarse sand, cement and the like. Although a certain amount of fly ash solid waste is added in the patent, coarse aggregates and fine aggregates are also needed, and the raw material acquisition is still limited.
CN106242482A discloses a high fluidity hydraulic fill sea mud anti-seepage curing material and a preparation method thereof, which comprises a component A and a component B: the component A consists of the following components: 30-60 parts of active inorganic mineral; 10-30 parts of a cementing material; 10-20 parts of industrial byproduct gypsum; 5-12 parts of instant soluble glass; 2-5 parts of quicklime; 1-3 parts of a stabilizer; the component A is ground into fine powder, and the water content is less than or equal to 1%. The inorganic mineral in the patent contains solid wastes such as steel slag, slag and the like, and gypsum is also added, but the water content of all raw materials is strictly controlled.
In summary, the traditional concrete in the form of the mould bag needs to use a large amount of coarse aggregate, fine aggregate and cement, and although researches and attempts have been made to add solid wastes, most of the concrete still needs to add coarse aggregate and fine aggregate, so that the concrete cannot be made from local materials sufficiently. In addition, the control of the water content of the raw material requires a drying process or the like, and thus energy consumption is large.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a cementing material, especially a high strength cementing material for mold bag concrete, which can ensure the strength of the material while mixing solid wastes and reducing the amount of cement by reasonably selecting and matching raw materials, and more importantly, the cementing material of the present invention can be particularly suitable for preparing mold bag concrete meeting engineering requirements of slope protection, bank protection, dike fixation, sea filling, cofferdam, field building, etc. by combining with shore soil.
On the other hand, the present invention aims to provide a mould bag concrete which does not use conventional coarse aggregate and fine aggregate and greatly reduces the amount of cement used.
In the use scenes of slope protection, bank fixation and the like of rivers, lakes and seas, the land resources almost do not need to be mined, transported and stored, and can be dug and used at any time. However, if the soil on the bank side is replaced with coarse aggregate or fine aggregate, the strength is often greatly reduced. Therefore, the invention aims to ensure that local materials can be obtained when the mould bag concrete is prepared by reasonably allocating the formula, and soil on the construction site is directly used as a raw material.
In order to achieve the above object, in one aspect, the present invention provides the following technical solutions:
the cementing material for the concrete of the mold bag comprises cement, industrial by-product gypsum, an anti-caking agent and a mineral admixture.
For the performance, the cementing agent comprises the following raw materials in percentage by weight: 15-30% of cement, 20-35% of industrial by-product gypsum, 10-20% of an anti-caking agent and 35-45% of a mineral additive. Unless otherwise specified, the contents are all weight percent, and the sum of the contents of the components is 100%.
In one embodiment, the cementing material is divided into a material A and a material B, wherein the material A comprises cement and a mineral admixture; the B material contains industrial by-product gypsum and an anti-caking agent. Further, the mass ratio of the material A to the material B is 3.
Further, the mineral admixture is selected from one or more of copper slag powder, phosphorus slag powder, fly ash, steel slag, natural zeolite and silica fume, and the slag powder is preferred. The industrial by-product gypsum is one or more selected from desulfurized gypsum, phosphogypsum, titanium gypsum, fluorgypsum, citric acid gypsum and salt gypsum.
Further, the anti-caking agent comprises a functional component and a dispersing component; wherein the functional component is a water-reactive component; the dispersing component is an inert component and does not react with water.
Further, the functional components comprise one or more of calcium oxide, magnesium oxide, anhydrous gypsum and semi-hydrated gypsum. It is to be emphasized here that the calcium oxide mentioned in the present invention is free calcium oxide, which otherwise does not meet the performance requirements of the functional component. The calcium oxide, magnesium oxide, anhydrous gypsum and the like used in the embodiments of the present invention can be obtained from commercial sources, such as by the chemical industry of judan, komi europe, national medicine and the like.
Preferably, the weight percentage of the calcium oxide (particularly free calcium oxide) in the functional component is 70-100%. Further, the content of calcium oxide is 75%, 80%, 85%, 90%, or 95% or more. The weight percentage refers to the weight ratio of the weight of the calcium oxide in the whole functional component. That is, it is not mandatory that the calcium oxide be present at 100% level, and some other functional component may be present, as long as the functional component is also water-reactive.
In another embodiment, the functional component comprises 70% to 100% by weight of anhydrous gypsum. Further, the content of the anhydrous gypsum is 75%, 80%, 85%, 90% or 95% or more. Other water-reactive components such as calcium oxide, magnesium oxide, and the like may be selected for the remaining content.
In another embodiment, the functional component comprises 60-80% by weight calcium oxide and 20% -40% by weight anhydrite.
The dispersing component is not particularly limited as long as it does not react with water.
The dispersing component may be at least partially selected from water-evolving substances, for example 10% or more than 15%, 20%, 25%, 30% water-evolving substances, the remainder being inert components which do not react with water.
Preferably, the dispersing component is at least partially a water-insoluble or poorly water-soluble substance, by which is meant a substance having a solubility in water of less than 0.01g/100g at 20 ℃. The lower the solubility, the more advantageous the anti-caking property, and for example, the solubility of less than 0.001g/100g may be further preferable. For the water-insoluble or poorly water-soluble substance, the content thereof in the dispersion component is preferably 10% or more, more preferably 15%, 20%, 25% or 30% or more by weight percentage.
In some embodiments, the dispersing component comprises one or more of calcium carbonate, silicon dioxide, tricalcium phosphate, calcium sulfite, aluminum oxide, ferric oxide, magnesium carbonate, and titanium dioxide, and other inert components which do not react with water can be optionally used, and the total content is 100%. The calcium carbonate refers to the main chemical component of CaCO 3 The material comprises one or more of common calcium carbonate, light calcium carbonate and heavy calcium carbonate. The calcium sulfite refers to a chemical composition CaSO 3 The group of substances comprises calcium sulfite, calcium sulfite hemihydrate. The silicon dioxide refers to the main chemical component of SiO 2 In addition to the commercially available onesPure silica, quartz powder, glass powder, ceramic powder, diatomite, fine sand powder, black and old bleaching, kaolin and the like. The other components are analogized in turn and refer to materials of which the main chemical components are related substances.
The above components of the present invention may be prepared per se or may be obtained from commercially available sources, such as by the chemical industry of Shilangu, komio, national medicine, san Mei, etc.
By way of illustration, in the following embodiments as particularly preferred examples, the dispersing component comprises from 60% to 100% by weight calcium carbonate, the remainder being other inert components that are not reactive with water; the dispersing component comprises 60 to 100 weight percent of tricalcium phosphate, and the balance of other inert components which do not react with water; the dispersing component comprises 40 to 100 weight percent of silicon dioxide, and the balance of other inert components which do not react with water; the dispersion component comprises 30-65 wt% of silicon dioxide, 15-35 wt% of aluminum oxide and the balance of other inert components which do not react with water; the dispersing component comprises 5 to 35 weight percent of calcium carbonate and 5 to 65 weight percent of calcium sulfite, and the balance is other inert components which do not react with water; the dispersing component comprises calcium carbonate, calcium sulfite, and other inert components that do not react with water, and the ratio of calcium carbonate: calcium sulfite: the weight ratio of other inert components which do not react with water is 2-4:1-5:2-4. In a preferred embodiment, the other inert component that is not reactive with water is calcium sulfate or calcium sulfate dihydrate.
For the avoidance of doubt, by "the dispersing component comprises from 60% to 100% by weight calcium carbonate, the remainder being other inert components which are not reactive with water", it is meant that no other inert components which are not reactive with water are required when the calcium carbonate content is 100%, but that other inert components which are not reactive with water are required when the calcium carbonate content is less than 100%, i.e. the content of other inert components which are not reactive with water is from 0 to 40%, the total content of calcium carbonate and other inert components which are not reactive with water being 100%.
Preferably, the dispersing component comprises 5-35% by weight of calcium carbonate and 5-65% by weight of calcium sulfite, the balance being other inert components that do not react with water, and the weight ratio of calcium carbonate: calcium sulfite: the weight ratio of other inert components which do not react with water is 2-4:1-5:2-4. Preferably, the other inert water-unreactive component is calcium sulfate or calcium sulfate dihydrate.
Furthermore, the weight percentage of the functional component is 5 percent to 70 percent, and the weight percentage of the dispersing component is 30 percent to 95 percent; preferably, the weight percentage of the functional component is 10-40%, and the weight percentage of the dispersing component is 60-90%; further preferably, the weight percentage of the functional component is 15-30%, and the weight percentage of the dispersing component is 70-85%. (ii) a Particularly preferred functional components are present in an amount of more than 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20% by weight; preferably, the weight percentage of the functional component is below 40%, 35%, 30%, 29% or 28%. Preferably the weight percent of the dispersed component is more than 60%, 65%, 70%, 71% or 72%; preferably, the dispersed component is present in an amount less than 89%, 88%, 87%, 86%, 85%, 84%, 83%, 82%, 81%, or 80% by weight. Too many functional components are involved, the reaction may be severe, and adverse effects are caused on the fluidity of the slurry, the performance of the soil curing agent and the like. Unless otherwise specified, the contents are in weight percent and all the contents add up to 100%.
Further, the density of the anti-caking agent is 1-4g/cm 3 Preferably 1 to 3g/cm 3 Further preferably 1.5 to 2.5g/cm 3 。
Furthermore, the fineness of the anticaking agent is 200 meshes to 2500 meshes, preferably 400 meshes to 2000 meshes. The fineness of the anticaking agent is particularly preferably 500 meshes, 550 meshes, 600 meshes, 650 meshes, 700 meshes, 750 meshes, 800 meshes, 850 meshes and 900 meshes or more. The fineness of the anticaking agent is preferably 1900 meshes, 1800 meshes, 1700 meshes, 1600 meshes and 1500 meshes or less.
Further, the specific surface area of the anti-caking agent is 800cm 2 More than g, preferably 2000-6000cm 2 (ii) in terms of/g. The specific surface area of the anticaking agent is preferably 2500cm 2 /g、3000cm 2 /g、3500cm 2 More than g. The specific surface area of the anticaking agent is preferably 5500cm 2 /g、5000cm 2 /g、4500cm 2 The ratio of the carbon atoms to the carbon atoms is less than g.
In one embodiment, a method for preparing a cementitious material is provided, comprising the steps of: (1) Premixing industrial byproduct gypsum and an anti-caking agent to obtain a premix; and (2) mixing the premix with cement and a mineral admixture.
In another embodiment, a method for preparing a cementitious material is provided, comprising the steps of: (1) mixing cement and a mineral admixture to obtain a material A; (2) Premixing industrial by-product gypsum and an anti-caking agent to obtain a material B; and (3) mixing the material A and the material B.
The invention also relates to the use of the above-mentioned binder, namely for the production of moulded-in concrete.
The invention also relates to a mould bag concrete which comprises the cementing material, a soil body, water and an optional additive. The details of the binder are described above and will not be repeated here.
Of course, if the industrial by-product gypsum used contains no water or has a low water content, no anti-caking agent can be used, in which case the moulded bag concrete comprises a cementing agent, a soil body, water, and optionally an additive; wherein, the cementing agent comprises the following raw materials in percentage by weight: 15-30% of cement, 20-35% of industrial by-product gypsum and 35-45% of mineral admixture, wherein the sum of the contents of all the components is 100%.
That is, when the industrial by-product gypsum contains water, the aforementioned embodiment can be selected, and when the water content of the industrial by-product gypsum is lower than 1%, the anti-caking agent can be completely omitted, and at this time, the dosage of each component is only required to be properly adjusted.
Meanwhile, if the additives such as a water reducing agent and a quick hardening agent are reasonably selected, unexpected excellent effects can be obtained. In one embodiment, the admixture comprises a water reducing agent in an amount of 0.5 to 5%, preferably 1 to 3% by weight of the cement. That is, when the water reducing agent is included in the formulation of the bag-in-mold concrete, it is advantageous to the product performance. In yet another embodiment, the admixture comprises a hardening accelerator in an amount of 1 to 10%, preferably 3 to 6% by weight of the cement. In yet another embodiment, the admixture comprises a water-reducing agent and a hardening accelerator, wherein the water-reducing agent is present in an amount of 0.5 to 3% by weight of the cement and the hardening accelerator is present in an amount of 1 to 7% by weight of the cement. Particularly, the formula contains the water reducing agent and the hardening accelerator at the same time, which is the most favorable and the most preferable scheme for the performance.
Furthermore, the soil body can be obtained locally, so that the cost is advantageous, and the soil body on the construction site is selected specifically; preferably the soil on shore. Further preferably seashore soil, lake shore soil, river shore soil. For example, when the mould bag concrete is made at seaside, the soil body at seaside is directly used as solidified soil; for example, when the mould bag concrete is made at the river side, the soil body at the river bank side is directly used as solidified soil; for example, the mould bag concrete is made beside the lake, and the soil body beside the lake is directly used as the solidified soil; and so on. In another embodiment, the soil mass is one or more of river dredged soil, coastal silt, engineered slag soil.
Further, the water content of the soil body is 10% -40%, preferably 15% -30%, and further preferably 20% -25%. Further, the weight ratio of the soil body, the cementing material and the water is that the soil body: cementing materials: water = 1400-1800; preferably, the soil body: cementing materials: water = 1500-1700; under the proportion, the performance of the mould bag concrete is improved.
Furthermore, the dosage of the cementing material is 30-50 percent of the soil body, preferably 35-45 percent, so that enough strength can be ensured. Preferably 36%, 37%, 38%, 39% or more; preferably 49%, 48%, 47%, 46%, 45% or less; most preferably 40%.
Preferably, the moulded bag concrete should meet one or more of the following conditions: (1) the fluidity of the mortar is 130-160mm; (2) the expansion degree is not less than 500mm; (3) The curing time is less than 30h, preferably less than 25h, and further preferably less than 20h; (4) The unconfined compressive strength is more than 5MPa, preferably more than 6.5MPa or more than 7.5MPa, further preferably more than 8.5MPa, such as 11MPa in 7 days; (5) The 28-day unconfined compressive strength is more than 10MPa, preferably more than 15 MPa. Most preferably, each condition is satisfied.
The invention also provides a preparation method of the mould bag concrete, which comprises the following steps: mixing the raw materials including cementing agent, soil (such as shore soil), water and optional additive, and injecting into a mold bag. Furthermore, a three-point pumping method is adopted. Further, the mould bag is 10-20 meters long, 5-15 meters wide and 10-30 centimeters thick.
The invention provides application of mould bag concrete, which is used in projects such as slope protection, bank fixation, sea filling, cofferdam, field building and the like.
Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The cementing material for the die-bag concrete is prepared by taking cement, industrial by-product gypsum, an anti-caking agent and a mineral admixture as raw materials according to a formula. The cementing material does not need to use coarse aggregate and fine aggregate.
(2) The cement content in the cementing material is reduced to be below 30 percent, and the solid wastes are added, so that the performance requirement in subsequent application can be still met.
(3) In the preparation process of the mould bag concrete, local materials are used, soil mass on a construction site is used, and under the reasonable formula selection, 28-day unconfined compressive strength of the concrete is more than 10MPa, the expansion degree is not less than 500mm, and the requirements of various performances of the mould bag concrete are met.
(4) For the problem that the raw materials with higher water content are easy to agglomerate to influence the performance, the invention creatively adds the anti-agglomeration agent, and well solves the anti-agglomeration problem.
Drawings
FIG. 1 shows the fluidity at 50% of the amount of the cementing material;
FIG. 2 shows the fluidity at 40% of the binder;
FIG. 3 shows the fluidity at a cement loading of 30%.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of protection of the present invention.
In the experiment, the calcium oxide is analytically pure and is purchased from the scientific chemical industry of Xilongu; the gypsum is industrial by-product gypsum with water content of 13.8%; calcium carbonate, calcium sulfite and calcium sulfate dihydrate are all purchased from Chinese medicines; the water reducing agent is purchased from Xika; the rapid hardening agent is available from the product of beform, electrical chemistry, japan.
Example 1:
and (4) selecting a cementing agent formula for an experiment. The test method refers to a JGJ/T70-2009 building mortar basic performance test method, and the compression strength of 7d and 28d is tested after forming and maintaining.
An anti-caking agent: according to the weight ratio of calcium sulfate dihydrate: calcium sulfite: the calcium carbonate is 2.
The test soil body is selected from east coast soil (the water content is 21%), coarse aggregate and fine aggregate are not used, the mixing ratio of cementing materials is 20%, the water-cement ratio is 1.5, the water content of industrial byproduct gypsum is 13.8%, and the detailed formula is shown in the following table 1.
TABLE 1 compression Strength test for different cement formulations
From the above test results, the strength of the test piece of the number J1 was higher than that of the other groups. Thus, group J1 was used as the base mix for the subsequent examples.
Example 2:
and (4) performing a cementing agent mixing amount selection experiment. The test method refers to a JGJ/T70-2009 building mortar basic performance test method to test the fluidity, the solidification test piece and the compressive strength, and the water consumption is dynamically adjusted according to the fluidity.
An anti-caking agent: according to the weight ratio of calcium sulfate dihydrate: calcium sulfite: the calcium carbonate is 2.
In the foregoing example 1, the blending ratio of the cementing material is 20%, and the 28d compressive strength in some tests is higher than 5Mpa, which can meet the performance requirements of the film bag concrete to a certain extent, and this test further improves the blending amount of the cementing material to study the film bag concrete, and the formula of the cementing material in the specific tests is shown in table 2 below, and the formula of the different blending amount tests is shown in table 3 below.
TABLE 2 Binder formulation
TABLE 3 compression Strength and fluidity tests for different cement admixtures
And (3) testing the fluidity of the mould bag concrete under different cementing agent mixing amounts: when the mixing amount of the cementing material is 50 percent, the fluidity of the cementing material is shown in figure 1 after 1 hour; when the mixing amount of the cementing material is 40 percent, the fluidity of the cementing material for 1 hour is shown in figure 2; when the cement content is 30%, the fluidity for 1h is shown in FIG. 3.
According to the test, when the mixing amount of the cementing material is 30%, the strength of the prepared mould bag concrete 28d can reach more than 5 MPa; if the strength of 7d is more than 5MPa, the mixing amount of the cementing material needs to be increased to 50 percent, but the fluidity reaches 200 within 1 hour.
Example 3:
and (3) according to different engineering requirements and special requirements on curing time and early strength of the bagged concrete mixture, developing an open bagged concrete formula optimization test. The test adopts the seashore soil of the east China, which is silt silty soil, and the water content is 21 percent. In the preferred embodiment 2, 40% of the mixing amount of the cementing material is taken as a basic mixture ratio; in addition, the adopted high-efficiency water reducing agent is powdery and is purchased from Xika; the rapid hardening agent is available from the product of beform, electrical chemistry, japan.
TABLE 4 moulded bag concrete Performance tests under different engineering requirements
As can be seen from the tests in Table 4, the mould bag concrete with different curing time can be obtained through further optimization proportioning test, and the curing time can be used for conventional engineering when 20 hours; the curing time is 7h and 4.3h, and the engineering can be used for engineering of tide and ocean wave climate; according to the characteristics of engineering, for example, it has special requirements for early strength of bagged concrete, and can be singly doped with water-reducing agent or can be mixed with cementing material of quick-hardening agent to prepare bagged concrete.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (26)
1. The high-strength cementing material for the die bag concrete is characterized by comprising cement, industrial by-product gypsum, an anti-caking agent and a mineral admixture.
2. The binder of claim 1 comprising the following raw materials in weight percent: 15-30% of cement, 20-35% of industrial by-product gypsum, 10-20% of an anti-caking agent and 35-45% of a mineral additive.
3. The cementing agent of claim 1 or 2, characterized in that the cementing agent is divided into a material A and a material B, wherein the material A comprises cement, mineral admixture; the B material contains industrial by-product gypsum and an anti-caking agent.
4. 4-binder according to claim 3, characterized in that the mass ratio of the A and B materials is 3.
5. The cement of any one of claims 1-4, wherein the cement satisfies one or more of the following conditions:
(1) The mineral admixture is selected from one or more of copper slag powder, phosphorus slag powder, fly ash, steel slag, natural zeolite and silica fume;
(2) The industrial by-product gypsum is one or more selected from desulfurized gypsum, phosphogypsum, titanium gypsum, fluorgypsum, citric acid gypsum and salt gypsum.
6. The binder of any one of claims 1-5 wherein the anti-caking agent comprises a functional component and a dispersing component; wherein the functional component is a water-reactive component; the dispersing component is an inert component and does not react with water.
7. The binder of claim 6 wherein the functional component comprises one or more of calcium oxide, magnesium oxide, anhydrite, hemihydrate gypsum;
and/or the dispersing component comprises one or more of calcium carbonate, silicon dioxide, tricalcium phosphate, calcium sulfite, aluminum oxide, ferric oxide, magnesium carbonate and titanium dioxide.
8. The binder of claim 6 or 7 wherein the functional component comprises from 70% to 100% by weight calcium oxide;
or the functional component comprises 70-100 wt% of anhydrous gypsum;
or the functional component comprises 60-80% of calcium oxide and 20-40% of anhydrous gypsum by weight percent.
9. The binder of claim 6 or 7 wherein the dispersing component comprises 60 to 100 weight percent calcium carbonate, the balance being other inert components that do not react with water;
or, the dispersing component comprises 60 to 100 weight percent of tricalcium phosphate, and the balance of other inert components which do not react with water;
or, the dispersing component comprises 40-100% by weight of silicon dioxide, and the balance of other inert components which do not react with water;
or the dispersing component comprises 30 to 65 weight percent of silicon dioxide, 15 to 35 weight percent of aluminum oxide and the balance of other inert components which do not react with water;
or the dispersing component comprises 5 to 35 weight percent of calcium carbonate and 5 to 65 weight percent of calcium sulfite, and the balance is other inert components which do not react with water;
or, the dispersing component comprises calcium carbonate, calcium sulfite, and other inert components that do not react with water, and the ratio of calcium carbonate: calcium sulfite: the weight ratio of other inert components which do not react with water is 2-4:1-5:2-4.
10. The binder of any of claims 6-9 wherein the functional component is present in an amount of 5-70% by weight and the dispersing component is present in an amount of 30-95% by weight; preferably, the weight percentage of the functional component is 10-40%, and the weight percentage of the dispersing component is 60-90%; further preferably, the weight percentage of the functional component is 15-30%, and the weight percentage of the dispersing component is 70-85%.
11. A method for preparing the cement of any one of claims 1 to 10, wherein: comprises the following steps: (1) Premixing industrial byproduct gypsum and an anti-caking agent to obtain a premix; (2) mixing the premix with cement and mineral admixture;
or, comprises the following steps: (1) mixing cement and a mineral admixture to obtain a material A; (2) Premixing industrial by-product gypsum and an anti-caking agent to obtain a material B; and (3) mixing the material A with the material B.
12. Use of the cement of any one of claims 1-11 in a moulded bag concrete.
13. A bagged concrete comprising the cementitious binder of any one of claims 1 to 10, a body of soil, water, and optionally an admixture.
14. The mould bag concrete is characterized by comprising a cementing material, a soil body, water and an optional additive; wherein, the cementing agent comprises the following raw materials in percentage by weight: 15-30% of cement, 20-35% of industrial by-product gypsum and 35-45% of mineral admixture.
15. A mould bag concrete according to claim 13 or 14, characterised in that the admixture comprises a water reducing agent in an amount of 0.5-5%, preferably 1-3% by weight of the cementitious material.
16. A moulded bag concrete according to claim 13 or 14, characterised in that the admixture comprises a hardening accelerator in an amount of 1-10%, preferably 3-6% by weight of the binder.
17. The mold bag concrete according to claim 13 or 14, wherein the admixture comprises a water reducing agent and a hardening accelerator, wherein the amount of the water reducing agent is 0.5-3% of the weight of the cement, and the amount of the hardening accelerator is 1-7% of the weight of the cement.
18. The mould bag concrete according to claim 13 or 14, wherein the soil mass is a construction site soil mass; further preferably seashore soil, lake shore soil, river shore soil and river shore soil.
19. The mould bag concrete according to claim 13 or 14, wherein the soil mass is one or more of river dredging soil, coastal silt, engineering muck.
20. A mould bag concrete according to any one of claims 13 to 19 wherein the moisture content of the soil mass is between 10% and 40%, preferably between 15% and 30%, more preferably between 20% and 25%.
21. A moulded bag concrete according to any one of claims 13 to 20 in which the amount of binder is 30% to 50% of the mass, preferably 35% to 45%.
22. The mold bag concrete according to any one of claims 13 to 21, wherein the weight ratio of the soil, the cementing material and the water added is soil: cementing materials: water = 1400-1800.
23. A mould bag concrete according to any one of claims 13 to 22 wherein the mould bag concrete meets one or more of the following conditions:
(1) The fluidity of the mortar is 130-160mm;
(2) The expansion degree is not less than 500mm;
(3) The curing time is less than 30h;
(4) The unconfined compressive strength is more than 6.5MPa after 7 days;
(5) The unconfined compressive strength of the concrete in 28 days is more than 10 MPa.
24. A method for the production of moulded bag concrete according to any one of claims 13 to 23, characterised in that the raw materials comprising cement, soil, water, optionally additives are mixed and poured into the moulded bag.
25. The method of producing the mold bag concrete according to claim 24, wherein: the length of the mould bag is 10-20 m, the width is 5-15 m, and the thickness is 10-30 cm.
26. Use of the moulded bag concrete according to any one of claims 13 to 23 for slope protection, bank reinforcement, sea reclamation, cofferdam, field construction.
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